Package org.apache.fop.fonts.truetype

Class TTFSubSetFile

java.lang.Object
org.apache.fop.fonts.truetype.OpenFont
org.apache.fop.fonts.truetype.TTFFile
org.apache.fop.fonts.truetype.TTFSubSetFile
public class TTFSubSetFile extends TTFFile
Reads a TrueType file and generates a subset that can be used to embed a TrueType CID font. TrueType tables needed for embedded CID fonts are: "head", "hhea", "loca", "maxp", "cvt ", "prep", "glyf", "hmtx" and "fpgm". The TrueType spec can be found at the Microsoft Typography site: http://www.microsoft.com/truetype/

  • Field Details

    • output

      protected byte[] output

    • realSize

      protected int realSize

    • currentPos

      protected int currentPos

    • offsets

      protected Map<OFTableName,Integer> offsets

    • locaOffset

      protected int locaOffset

    • glyphOffsets

      protected int[] glyphOffsets
      Stores the glyph offsets so that we can end strings at glyph boundaries

    • newDirTabs

      protected Map<OFTableName,OFDirTabEntry> newDirTabs
      The dir tab entries in the new subset font.

  • Constructor Details

    • TTFSubSetFile

      public TTFSubSetFile()
      Default Constructor

    • TTFSubSetFile

      public TTFSubSetFile(boolean useKerning, boolean useAdvanced)
      Constructor
      Parameters:
      useKerning - true if kerning data should be loaded
      useAdvanced - true if advanced typographic tables should be loaded

  • Method Details

    • createDirectory

      protected void createDirectory()
      Create the directory table

    • createLoca

      protected void createLoca(int size) throws IOException
      Create an empty loca table without updating checksum
      Throws:
      IOException

    • createCvt

      protected boolean createCvt(FontFileReader in) throws IOException
      Copy the cvt table as is from original font to subset font
      Throws:
      IOException

    • createFpgm

      protected boolean createFpgm(FontFileReader in) throws IOException
      Copy the fpgm table as is from original font to subset font
      Throws:
      IOException

    • createName

      protected boolean createName(FontFileReader in) throws IOException
      Copy the name table as is from the original.
      Throws:
      IOException

    • createOS2

      protected boolean createOS2(FontFileReader in) throws IOException
      Copy the OS/2 table as is from the original.
      Throws:
      IOException

    • createMaxp

      protected void createMaxp(FontFileReader in, int size) throws IOException
      Copy the maxp table as is from original font to subset font and set num glyphs to size
      Throws:
      IOException

    • createPost

      protected void createPost(FontFileReader in) throws IOException
      Throws:
      IOException

    • createPrep

      protected boolean createPrep(FontFileReader in) throws IOException
      Copy the prep table as is from original font to subset font
      Throws:
      IOException

    • createHhea

      protected void createHhea(FontFileReader in, int size) throws IOException
      Copy the hhea table as is from original font to subset font and fill in size of hmtx table
      Throws:
      IOException

    • createHead

      protected void createHead(FontFileReader in) throws IOException
      Copy the head table as is from original font to subset font and set indexToLocaFormat to long and set checkSumAdjustment to 0, store offset to checkSumAdjustment in checkSumAdjustmentOffset
      Throws:
      IOException

    • buildSubsetIndexToOrigIndexMap

      protected int[] buildSubsetIndexToOrigIndexMap(Map<Integer,Integer> glyphs)

    • createHmtx

      protected void createHmtx(FontFileReader in, Map<Integer,Integer> glyphs) throws IOException
      Create the hmtx table by copying metrics from original font to subset font. The glyphs Map contains an Integer key and Integer value that maps the original metric (key) to the subset metric (value)
      Throws:
      IOException

    • readFont

      public void readFont(FontFileReader in, String name, String header, Map<Integer,Integer> glyphs) throws IOException
      Reads a font and creates a subset of the font.
      Parameters:
      in - FontFileReader to read from
      name - Name to be checked for in the font file
      glyphs - Map of glyphs (glyphs has old index as (Integer) key and new index as (Integer) value)
      Throws:
      IOException - in case of an I/O problem

    • getFontSubset

      public byte[] getFontSubset()
      Returns a subset of the fonts (readFont() MUST be called first in order to create the subset).
      Returns:
      byte array

    • stream

      public void stream(TTFOutputStream ttfOut) throws IOException
      Description copied from class: OpenFont
      Streams a font.
      Overrides:
      stream in class OpenFont
      Parameters:
      ttfOut - The interface for streaming TrueType tables.
      Throws:
      IOException - file write error

    • scanGlyphs

      protected void scanGlyphs(FontFileReader in, Map<Integer,Integer> subsetGlyphs) throws IOException
      Throws:
      IOException

    • writeBytes

      protected void writeBytes(byte[] b)

    • writeUShort

      protected void writeUShort(int s)
      Appends a USHORT to the output array, updates currentPost but not realSize

    • writeUShort

      protected void writeUShort(int pos, int s)
      Appends a USHORT to the output array, at the given position without changing currentPos

    • writeULong

      protected void writeULong(int pos, int s)
      Appends a ULONG to the output array, at the given position without changing currentPos

    • pad4

      protected void pad4()
      Create a padding in the fontfile to align on a 4-byte boundary

    • updateCheckSum

      protected void updateCheckSum(int tableStart, int tableSize, OFTableName tableName)

    • getCheckSum

      protected static int getCheckSum(byte[] data, int start, int size)

    • createCheckSumAdjustment

      protected void createCheckSumAdjustment()